I hope this is helpful.
Going to the Ring on a SES trip is not all about going round the ring, there is a lot more to the trip than that.
It is not compulsory to drive the ring, the first year I went in 2009 I drove just 2 laps and obviously I've been every year since.
The important thing is that everyone enjoys the trip and returns safely !
I have watched the following videos many times I hope the newbies find it helpful.
https://www.youtube.com/watch?v=qhAvWCFOzD4#t=16
https://www.youtube.com/watch?v=HDCqOZ1upoo
https://www.youtube.com/watch?v=GdUZPlkFcEA
This vid gives you an idea of the different gradients and turns because you can see 2 others in front of the camera car:
https://www.youtube.com/watch?v=jM46Wux0GcE